In laboratory for Thermal technique and fire protection of the IMS institute, determination of gross heat of combustion of materials is conducted according to standard SRPS EN ISO 1716. Testing is performed with the goal of classification of building materials in accordance to standard SRPS EN 13501-1.
Gross heat of combustion represents energy released after total combustion of material specimen. This test is performed for all materials that are to be classified as non-combustible – group A1 or A2. If material is to be classified as A1 in accordance to standard SRPS EN 13501-1 incombustibility test needs performed for the given material in accordance to standard SRPS EN ISO 1182.
Test is performed on specimens of average mass of 0,5g in calorimetric bomb at pressure of 30bar. If product consists of multiple layers, gross heat of combustion needs to be determined for every layer individually. Gross heat of combustion is released energy per unit of mass [MJ/kg]. For products that consist of multiple layers and for spreads, gross heat of combustion is given as [MJ/m² ].
Material needs to have gross heat of combustions which is less than 2 MJ/kg or less than 1,4 MJ/m 2 for multiple layer materials products and for spreads in order to be classified as A1 class material. If material is to be classified as A2 class material, gross heat of combustion needs to be less than 3 MJ/kg, or less than 4 MJ/m² for multiple layer materials and for spreads. Besides to determining of gross heat of combustion, additional tests need to be conducted for product to be classified as A1 or A2 class. Table that shows required tests for each class is given in standard SRPS EN 13501-1.